--- a/src/stream/ngx_stream_core_module.c
+++ b/src/stream/ngx_stream_core_module.c
@@ -252,7 +252,7 @@ ngx_stream_core_listen(ngx_conf_t *cf, n
     in_port_t                     port;
     ngx_str_t                    *value;
     ngx_url_t                     u;
-    ngx_uint_t                    i;
+    ngx_uint_t                    i, backlog;
     struct sockaddr              *sa;
     struct sockaddr_in           *sin;
     ngx_stream_listen_t          *ls;
@@ -343,6 +343,7 @@ ngx_stream_core_listen(ngx_conf_t *cf, n
 
     ls->socklen = u.socklen;
     ls->backlog = NGX_LISTEN_BACKLOG;
+    ls->type = SOCK_STREAM;
     ls->wildcard = u.wildcard;
     ls->ctx = cf->ctx;
 
@@ -350,8 +351,17 @@ ngx_stream_core_listen(ngx_conf_t *cf, n
     ls->ipv6only = 1;
 #endif
 
+    backlog = 0;
+
     for (i = 2; i < cf->args->nelts; i++) {
 
+#if !(NGX_WIN32)
+        if (ngx_strcmp(value[i].data, "udp") == 0) {
+            ls->type = SOCK_DGRAM;
+            continue;
+        }
+#endif
+
         if (ngx_strcmp(value[i].data, "bind") == 0) {
             ls->bind = 1;
             continue;
@@ -367,6 +377,8 @@ ngx_stream_core_listen(ngx_conf_t *cf, n
                 return NGX_CONF_ERROR;
             }
 
+            backlog = 1;
+
             continue;
         }
 
@@ -530,5 +542,21 @@ ngx_stream_core_listen(ngx_conf_t *cf, n
         return NGX_CONF_ERROR;
     }
 
+    if (ls->type == SOCK_DGRAM) {
+        if (backlog) {
+            return "\"backlog\" parameter is incompatible with \"udp\"";
+        }
+
+#if (NGX_STREAM_SSL)
+        if (ls->ssl) {
+            return "\"ssl\" parameter is incompatible with \"udp\"";
+        }
+#endif
+
+        if (ls->so_keepalive) {
+            return "\"so_keepalive\" parameter is incompatible with \"udp\"";
+        }
+    }
+
     return NGX_CONF_OK;
 }